Firing mechanism for automatic guns



Dec. 25, 1945. J. vEsELY FIRING MECHANISM FOR AUTOMATIC GUNS Filed March 4, 1942 2 Sheets-Sheet l Tosef VESQ-It, \NYEI\\ TQQ Patented Dec. 25, 1945 UNHTE. STTE.

s Parent orricr.

2 Claims.

The present invention relates to improvements m sub-machine guns of the dynamic type and particularly in the firing mechanisms of such guns.

Guns of the so-called dynamic type" are guns combination with a gun employing a breech block' of the dynamic type, serves positively to prevent premature firing of the cartridge but fires the Cartridge at the proper moment, and makes use of the kinetic energy of the forwardly moving breech block both for firing the Cartridge and for absorbing surplus recoil energy.

This and other objects are accomplished according to the present invention by the arrangement and combination of parts set forth in the following detailed description, defined in the appended claims and illustratively exemplifled in the acompanying drawings in which:

Figure 1 is a sectional side elevational view of the gun which has been chosen for illustrating the invention;

Figure 2 is a sectional side view of a part of the gun on a larger scale and showing the positions of operative parts as the forward movement of the breech approaches completion;

Figure 3 is a view similar to Figure 2, but showing the positions of the same operative parts immediately after firing a round;

Referring to the drawings, the gun comprises a barrel I surrounded by a cooling jacket 2, this barrel being rigidly connected with a gun body 3 which is of circular form in cross-section. The usual rearsight 4 is secured to the generally cylindrical gun body or casing 3 and provision is made in the lower part of the gun body for attaching a magazine 5 of any suitable design. For example, a holder 6 may be provided for this purpose at the lower side of the gun body 3, to receive the magazine 5 which is held in the holder B by a suitable catch 1.

The gun body is rigidly but removably connected at its rear end to a butt holder 8 which is in turn connected with a butt 9 of any convenient known form.

The butt holder 8 accommodates the trigger mechanism, indicated generally by ID in Figure 1.

Great Britain June 10, 1941 'I'he breech blockguide I I is of generally semicircular Vhollow form in cross-section and is mounted within the gun body 3 for co-operation with a breech block I2 forming part of a breech action of the above defined dynamic type. The breech block IZ is also of semi-cylindrical form. It is substantially oomplementary to the said guide i I and fits slidingly the interior of the gun body when mounted therein on the breech block guide II.

The firing mechanism is mounted in the for- Ward end of the breech block I2 (Figs. 2 and 3) In the illustrated embodiment of the invention the firing mechanism comprises a firing pin I3, mounted for axial movement in a Vertical channel in the forward end of the breech block I2 and biased by a spring I4 for movement in the rearward direction with respect to the breech block. A lever I5 is journalled for rocking movement on a pivot I6 in the said channel within the breech block, one end Aof said lever I5 engaging the rear-headed end of the firing pin I3 and the other end engaging the rear end of an actuating rod I'I also mounted for longitudinal sliding movement, in the axial direction, in the end of the breech block.

The forward end of the actuati-ng rod I'I is arranged to make engagement with an abutment I provided in the gun body 3 as the breech block approaches its forward position. The same abutment IS also determines in combination with the stop face a of the breech block, the forward movement of the letter.

Whilst the breech block is in its open position as shown in Figures 1 and 2, the firing pin l3 is held by the spring Id in its retracted position and, through the intermediary of the lever IS, maintains the actuating rod Il in a position in which its fore end projects forwardly from the stop face a of the breech block IZ.

As the breech block I2 approaches completion of its forward movement, the fore end of the actuating rod I'I strikes against the above-mentioned abutment I8 in the gun body 3 so that the actuating rod I'I is moved rearwardly relatively to the breech block, and by the engagement of the rear end of the rod l'l with the lever L5 the latter is caused to rock on its pivot IIi to, in turn, thrust the firing pin I3 forwards in the breech block to fire a Cartridge in the firing Chamber. It Will be clear that the firing pin 13 cannot be actuated to fire the Cartridge unless the breech block I2 has reached the exact position in which the firing is to take place.

Furthermore, the drawings show clearly that the rod I1 can be easily removed from the breech block |2 upon removal of pin IG and lever I5.

I claim:

1. A sub-machine gun of the dynamic type comprising in combination. a tubular gun body, a breech block axially slidable within the said body. a firing pin mounted for Iimited axial sliding movement in the forward portion of the said breech block, spring means urging said firing pin in a rearward direction. a double ended roekabie iever pivoted between its ends in the forward part of said breech block and having one end freely engaging with the rear end of said firing pin for urging the iatter forward1y,-an easily repiaceable actuating rod mounted, independently of said lever, for axial sliding movement in the forward portion of the said breech block and arranged to cooperate at its rear end With the other end of said lever. and an abutment upon the body of said gun arranged to engage. as the breech block approaches its final forward position, the forward end of the said actuating rod in order to slide the same rearwardly in the breechrbiock for actuating the said rockabie iever and firing pin.

2. A sub-machine gun of the dynamic type comprising in combination, a tubular gun body. a breech block axially slidable Within said gun body, said gun body having at its forward part an abut- `ment constituting a breech block stop and said breech block having at its front end a stop face co-operating with said abutment, a firing pin mounted for axial rectilinear sliding movement in the forward portion of the breech block, spring -means urging said firing pin in a rearward direction, adouble ended rockable lever pivoted between its ends in the forward part of the breech fblock and having one end freely engaging with the rear endof said firing pin, a displaceable actuating rod mounted in the front upper portion of the breech block for rectilinear sliding movement in a direction parallel to the movement of the said Vi'iring vpin and having its rear end in engagement with the second end of said rockable lever, and having its front end arranged to project normally forwardly beyond the said stop face of the breech block and to engage the said abutment on the gun body as the breech block approaches its final forward position.

J OSEF VESELY. 

